Traction-engine



(No Model.) 7 Sheets-sheaf 1.

- M. E. HERSHEY. TRACTION ENGINE; v No. 367,912. Patented Aug, 9, 1887.

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M.'E.HERSHEY.

TRAGTIOlI ENGINE.

No. 367,912. Patented Aug. 9, 1887 WITNESSES (No Model.) 7 Sheets-Shet 3-."

M. E. HERSHEY. v

TRACTION ENGINE.

No. 367,912. Patented Aug. 9, 1887.

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' M. E. HERSHEY.

TRACTION ENGINE.

No. 367,912. Patented Aug. 9, 1887.

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M. E; HERSHEY.

TRACTION ENGINE.

N0. 367, 912. v I Patented Aug. 9, 1887.

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7 Sheets-Shet' 7.

" (No Model.) M. E. HERSHEY.

TRAOTION ENGINE.

No. 367,912. Patented Aug. 9, 1887.

1 WITNESSES I 04; Q. 6.

A fforney lUNIT I) STATES PATENT OFFICE.

MARTIN E. HERSHEY, or HARRISBURG, PENNSYLVANIA.

TRACTION-ENGINE.

SPECIFICATION forming part of Letters Patent No. 367,912, dated August 9, 1887.

Application filed July 2|, 1884. Serial No. 138.358. (No model.)

T on whom it may concern.-

Be it known that. I, MARTIN E. HERSHEY,

- of Harrisburg, in the county of Dauphin and this specification, and to the figures and letters of reference marked thereon.

My improvements relate, first, to an improved frame and housing for the main axle and gear-shaft; secondly, to an improved construction of the front carriage; thirdly, to improved means for connecting and disconnecting the propelling-gear; fourthly, to improved means for locking the loose driving orground wheel to the axle; and, lastly,to certain de tails of construction, to be hereinafter de scribed and claimed.

In the accompanying drawings, Figure l represents a perspective view of a road-roller constructed in accordance with my invention.-

Figs. 2 and 3 are similar views taken from the front and rear of the machine, respect ively. Fig. 4: is a .front View, and Fig. 5 a

side View, of the boiler, showing the frame or housing for the main axle and gear-shaft.

Fig. 6 is a perspective view of said frame or housing detached. Fig. 7 is a side view, Fig. 8, an end view, and Fig. 9 a top plan view, of a portion of the machine, showing the construction of the tanks. Figs. 10 and 11 are views showing the construction of the gearshifti-ng mechanism. Figs. 12 and 13 are respectively a perspective view and a sectional view of the means for throwing the loose ground or driving wheel into and out of connection with the main axle.

Similar letters of reference in the several figures indicate like parts. I

The letters A A indicate the housings which receive the mainaxle. These housings are located on opposite sides of the passageway leading to the fire-box. Each one has a wide vertical flange, B, a narrow vertical flange, b, at right angles to the flange B, a top flange, O, a tubular bearing portion, D, for the passage of the main axle, and a tubular extension or boss, E, forming a continuation of the bearing D.

The bosses 'E project through and accurately fit openings formed in the extension F of the fire-box sheet, as shown in Fig. 5, and sustain the greater portion of the weight of the boiler and mountings, thereby relieving the bolts f, which secure the housings to the boiler,'from the liability ofworking loose. The inner sides of the housings are provided with flanges to.

which a flanged thimble, H, is bolted. This thimble serves to brace and strengthen and solidly connect the two housings, and also to cover and inclose the main axle which passes through it.

To the top flanges, G, of the housing is bolted the bracket I, upon which the gearshaft J is supported.

The housings,the bracket I, and the connecting-thimble together form a strong, compact, well-braced frame. Instead of connecting and bracing the lower parts. of the housings by means of the thimble, other modes of connection maybe employed; but I prefer the thimble on account of its offering a protection to the axle as well as a continuation of the bearing for the same.

An extension-sheet, K, is bolted or otherwise secured to thcboiler or fire-box extension and extends rearward and around under the firebox, being provided with an opening or openings, L, for the discharge of the ashes and cinders raked from the latter. this extension-sheet, at a point behind the ground-wheels M M of the machine, the tank N is secured, preferably, by means of flanges or angle-irons, as shown in Fig. 9. The tank is constructed of U shaped form, so as to leave a central passage-way, 0, through which access to the fire and ash pit can be readily had. One of its compartments'may be used for carrying water and the other for fuel, or both may be employed for either purpose, as desired. By reason of the curved or circular form of the extension-sheet K avery rigid connection is made between the boiler and the tank without unnecessary weight of material. A wooden or .metal platform,.l?, is preferably arranged in the passage-way, over the 6Xl3ODSl0l1-ShGOl3, for the engineer to stand upon.

For the purpose of freeing the ground-wheels M M'of dirt or deposit in going over roads, I provide suitable scrapers, Q, It, for acting upon them. The scrapers Q, each consist of a plate To the rear of from a bracket, Q, and having connected to it an arm or lever, Q, provided with a fixed or an adjustable connterwvcigh t, Q that operates to hold the scraper at all times to the face of the wheel.

Each of the scrapers R consists of a blade hinged to a bracket, R, on the tank and pressed outward against the face of the groundwheel by means of aspring, R. Either or both of these forms of scrapers may be used; but I prefer to use them both.

The front wheels, S, are journaled in a yoke, S, which in turn is connected by a horizontal pivot, S, to a vertical shaft, S, that has its hearings in the upper and lower horizontal arms, 8 S, ofahousing, S. This form of connection allows a practically universal movement of the yoke and wheels, insu res frec'control and easy management of the front carriage under all conditions of the road, the vertical shaft revolving freely in its bearings and permitting the requisite lateral swing, while the joint between the yoke and said shaft permits the necessary free vertical vibration. The housing S incloses the entire forward end of the boiler, as shown in Fig. 1, and forms a very strong and rigid connection therewith.

Suitable scrapers, S, are applied to the front wheels for the purpose of keeping their surfaces clear.

The letter U, Figs. 10 and 11, represents the crank-shaft of the machine; U, a pinion mounted upon aslceve, U secured to the said shaft, and connected to said sleeve by means In traction -engines where compensating gears are used, as in my present machine, it is necessary that one of the main ground-wheels be left free on its axle, in order that curves may be accomplished and turns made with facility, but when either wheel gets on slippery ground the loose wheel is liable to stand still, leaving the compensating-gear to play upon itself. To provide against a contingency of this kind I have in the present machine provided a locking device by which the loose wheel can be quickly locked to the drivingaxle, and thus cause both wheels to be driven by the latter. Figs. 12 and 13 illustrate this locking device. As shown in said figures, I form upon the outer face of the hub of the loose wheel \V one or more, but preferably two, stout lugs, NV, while to the end of the driving-axle I secure a stout collar, Z, by means of a bolt, Z. This collar has projecting lugs Z, between which a stontpawl or stop, Z, is hinged npon abolt, Z. \Vhen this pawl or stop is turned down, it is brought into the path of the lugs \V on the hub, and engages with one or the other of said lugs, thus locking the wheel securely to the axle, so as to revolve with it. A handle, Z, is secured to the pawl or stop for convenientlyswinging it up and down, and a spring-pressed lockingstem, Z, located within the collar, is provided for holding it securely in either position in which it may be adjusted.

I-do not claim herein the construction of the boiler and tank shown and described herein,

having made such matter subject-matter of a its bearings in said brace or bracket, substantially as described, and for the purpose speci- 5. The combination, with the fire-box extension, of the two axle housings secured to the same, the connecting brace or bracket above, and the connecting-thimble or rigid connection below, the said housings, bracket, and thimble, constituting av strong, compact, and well-braced frame, substantially as described.

6. The combination, with the groundwvheel of a traction-engine or road-roller, ofa scraper mounted upon a projectingshaft or stem and held to its work by a fixed or adjustable counter-weight, substantially as described, and for the purpose specified.

7. The combination, with the boiler, of the housing entirely inclosing the front end ofthe same, and having the upper and lower arms constituting the fixed bearings of the vertical front shaft,the said vertical shaft and the yoke hinged to it and carrying the front whecls,substantially as described. 7

8. The combination, with the crank-shaft its screw-threaded hub mounted on the reduced shaft extension, the screw threaded yoke, and the rods connecting the yoke to the pinion, the whole arranged substantially as described.

9. The combination, with the crank-shaft, the sleeve fixed thereto, the fly-wheel, the hand-wheel, and its screw threaded hub mounted on the shaft-extension, the yoke and the rods passing through the hub of the flywheel and connecting the yoke with the shifting-pinion, substantially as described.

10. The combination, with the driving or ground wheel having the lug or lugs on its hub, of the collar secured to the driving'axle, the pawl or stop hinged to said collar,and the spring-pressed stein located in the collar and adapted to hold the pawl or stop either into or out of engagei'nent with the wheel-hub, substantially as described.

MARTIN E. HERSHEY. Witnesses:

H. P. SAYFORD, THOMAS Rnnsn, Jr. 

